Programming Interview Questions

Mando Dong

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Comment hidden because of low score. Click to expand.

of 7 vote

def sort_array array
	(0..array.length-1).step(2).each do |index|
		if index + 1 < array.length-1 and array[index] > array[index+1]
			swap array, index, index+1
		end
		if index + 2 < array.length-1 and array[index+1] < array[index+2]
			swap array, index+1, index+2
		end
	end
	array
end

def swap array, index, index2
	temp = array[index]
	array[index] = array[index2]
	array[index2] = temp
end

- Mando Dong August 08, 2015 | Flag Reply

Comment hidden because of low score. Click to expand.

of 0 vote

what about 'aabcdddcbaa' ?

- Mando Dong August 07, 2015 | Flag Reply

Comment hidden because of low score. Click to expand.

of 1 vote

I think the answer is 24.

solve for integer k such that 150/k + k - 1 is minimum. k is 12 and min is 23.5 => 24

Divide 150 men into 12 groups of 12 people and the last group has 6 people. The worst case would be that he starts on the first group and then goes down all the way to the 12th group and the man said YES. Then he go to the start of the group and ask the rest of the 11 people. You can not do binary search because once there is a second YES, you are done done.

- Mando Dong August 07, 2015 | Flag Reply

Comment hidden because of low score. Click to expand.

of 1 vote

require "prime"

def find_highest_digit l, r
	count = Array.new(10, 0)
	Prime.each(r) do |prime|
		if prime >= l
			number_arr = prime.to_s.split('')
			while !number_arr.empty?
				digit = number_arr.pop
				count[digit.to_i] += 1
			end
		end
	end
	if count.inject(:+) == 0
		-1
	else
		max = 1
		max_index = nil
		(0..9).each do |index|
			if count[index] >= max
				max_index = index
				max = count[index]
			end
		end
		max_index
	end
end

- Mando Dong July 20, 2015 | Flag Reply

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